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Can't re-activate Nitro PDF 4.91


Augusta Amadio
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Augusta Amadio

Hi, I re-installed Nitro PDF 4.91 on my computer using the disc, but it will not allow me to activate again and only works in trial mode. I have tried to find serial number on your activation portal, but it can't find the number (i'm assuming it's because my software is PDF only, not Pro). Are you able to assist with this please.

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  • Official Nitronaut
Allain Umailin

Hello @Augusta Amadio,

Thank you for reaching out to us through our Community Forums!

Are you installing Nitro PDF 4.91 on a Windows 10 machine? If yes, Nitro PDF 4.91was developed, released and then eventually discontinued prior to Windows 10 being released which is why there is no compatibility from the get-go. It has been discontinued as documented in our Sunset Policy: https://www.gonitro.com/nps/product-details/sunset-policy 

If you would like to trial our latest product, Nitro Pro 13, you can download it from here: https://www.gonitro.com/pro/try and it will run for free as a full-featured product for 14 days!

With regard to upgrading your old version to Nitro Pro 13, unfortunately, Nitro Pro 6 to Nitro Pro 12 are only allowed for the discounted rate.

If you are interested in purchasing Nitro Pro 13 Basic Plan from our website, kindly visit https://www.gonitro.com/pricing 

Thank you for choosing Nitro and I hope this helps!

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Augusta Amadio

Hi Allain, I have installed the Nitro PDF 4.91 on a Windows 8.1 machine, so it should be working. How do I get it to activate please? I do not want or need to upgrade, would just like to be able to use what I have at this stage and it should work on my version of windows. Many thanks.

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  • 3 weeks later...
Augusta Amadio

Hi, I would appreciate a response to my 15 April post please. There seems to be no way to contact anyone directly about this issue and I would really like it resolved. Many thanks, Augusta

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